Fault-tolerant voted output system

Details Fault-tolerant voted output system Fault-tolerant voted output system

1985-02-08

1988-02-16

Atkinson, Charles E.

Excavating

371 15, G01R 3128

Patent

active

047260262

ABSTRACT:
A majority-voted output circuit generates an output parameter which is the majority vote of its input parameters by series-parallel combination of four intermediate switches, each said switch being a Boolean function of the input parameters, and the circuit being arranged so that failure of any one switch does not affect the value of the output parameter. Alternate embodiments are provided which use "don't care" signals to allow the majority vote of less than the full complement of input parameters. The majority-voted output circuit is subjected to testing by stepped transitions of its input parameters (to test for failure of any of the four intermediate switches) and by forcing current flow through predetermined current paths (to test for failure of a particular electrical connection).

REFERENCES:
patent: 3069562 (1962-12-01), Steele
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patent: 3639778 (1972-02-01), Cerreghino et al.
patent: 4092589 (1978-05-01), Chau et al.
patent: 4365334 (1982-12-01), Smith et al.
patent: 4464722 (1984-08-01), Von Osten
patent: 4497056 (1985-01-01), Sugamori
Richards, Arithmetic Operations in Digital Computers, D. Van Nostrand Co., Inc., Princeton, N.J., pp. 44, 45.

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